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I have an older 4:3 LG flatron plasma screen, model number is MZ-40PA18. The set takes a very long time to come on from power down, ok from standby, also two black lines are coming down from roughly centre top of screen. The lines are about a foot long and 4inches wide, they change from black to red or green depending on the picture. Any ideas what the fault could be on this set? Thanks Davey